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2. 5 to 3 times as much t e t r a c h l o r o p h e n o l as surfaced lumber d i d , when they were t r e a t e d i n the same s o l u t i o n . ; ACS Symposium Series; American Chemical Society: Washington, DC, 1977. ch002 2. csERjEsi Prevention of Stain and Mould 29 three times more concentrated than t h a t used f o r roughsawn lumber f o r e q u i v a l e n t treatment (15). 3. Large v a r i a t i o n s i n the r e t e n t i o n s (the maximum being 10 χ higher than the minimum) were found i n the lumber t r e a t e d i n the same s o l u t i o n (26).

Howe v e r , i n a number o f g e n e r a , t h e sapwood p i t membranes a l s o c o n t a i n p o l y p h e n o l s i n some c a s e s , b u t t h e d i s t r i b u t i o n i s not u n i f o r m even w i t h i n spec i e s . I n h e a r t w o o d , a l l p i t membranes o f t h e g e n e r a s t u d i e d a p p e a r t o c o n t a i n p o l y p h e n o l s i n add i t i o n t o the o t h e r major c h e m i c a l components. The p r e s e n c e o f l i g n i n i n t h e p i t membrane h a s n o t b e e n p o s i t i v e l y established.

Responsibilities and risks i n v o l v e d in the use of wood-protecting c h e m i c a l s . " Can. Dep. Nat. H e a l t h Welfare, Occup. H e a l t h Rev. (1970) 21(3-4) 1-6. , F o r . P r o d . J. , Koch, P. , F o r . P r o d . J. (1961) 11(6) 258-260. , F o r . Prod . J. (1976) 26(1) 32-33. , B o t . Review (1945) 11(7) 398-415. F. A. Tech. No. 1046 (1951) 60 pp. , F o r . P r o d . J. (1975) 25(8) 38-41. ; ACS Symposium Series; American Chemical Society: Washington, DC, 1977. 3 Chemical Methods of Improving the Permeability of Wood D A R R E L D.

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